十字形二维稀疏混合MIMO相控阵雷达收发阵列设计

Joint design of transceiver array for cross-shaped two-dimensional sparse hybrid MIMO phased array radar

针对二维混合多输入多输出(MIMO)相控阵雷达发射子阵分割带来的自由度损失进而影响雷达系统参数估计性能的问题,提出一种基于十字阵的二维稀疏混合MIMO相控阵雷达收发阵列设计方法.首先,结合稀疏阵列-共轭嵌套阵对混合MIMO相控阵雷达的收发端进行稀疏设计;其次,对混合MIMO相控阵雷达产生的合阵进行做差处理,得到阵元位置差的差异阵列;最后,通过空间平滑处理进行波达方向估计.仿真实验表明,相较于传统的二维混合MIMO相控阵雷达,所提出方法仅利用两个互相垂直的一维线阵便可形成阵列的二维平面扩展,同时,在不增加阵元个数的前提下可有效扩展雷达阵列虚拟阵元数目,提高阵列的自由度以及波达方向估计性能.

Aiming at the problem of the loss of degree of freedom caused by the transmitting array partitioning of two-dimensional hybrid multiple input multiple output(MIMO)phased array radar and its influence on the parameter estimation performance of radar system,the design of a transceiver array for two-dimensional hybrid MIMO phased array radar based on a cross array is proposed.Firstly,a sparse array-conjugated nested array is introduced into the design of the transceiver array of hybrid MIMO phased array radar.Then,the coarray generated by the hybrid MIMO phased array radar is processed to obtain the difference coarray of the position difference of the array elements.The difference coarray is finally subjected to spatial smoothing processing to estimate the direction of arrival.Simulation experiments show that compared with the traditional two-dimensional hybrid MIMO phased array radar,the proposed radar can form two-dimensional planar array expansion by two mutually perpendicular one-dimensional linear arrays,and does not increase the number of array elements.Under the premise,the number of virtual array elements of the radar array can be effectively expanded,and the degree of freedom of the array can be improved to improve the estimation performance of the direction of arrival.